diff options
Diffstat (limited to 'src/arch/x86/transitions/librm_mgmt.c')
| -rw-r--r-- | src/arch/x86/transitions/librm_mgmt.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/arch/x86/transitions/librm_mgmt.c b/src/arch/x86/transitions/librm_mgmt.c index 85cfc8f..da221e8 100644 --- a/src/arch/x86/transitions/librm_mgmt.c +++ b/src/arch/x86/transitions/librm_mgmt.c @@ -14,6 +14,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <realmode.h> #include <pic8259.h> #include <ipxe/shell.h> +#include <ipxe/cpuid.h> /* * This file provides functions for managing librm. @@ -386,6 +387,21 @@ static void iounmap_pages ( volatile const void *io_addr ) { io_addr, first, i ); } +/** + * Check for FXSAVE/FXRSTOR instruction support + * + */ +__asmcall void check_fxsr ( struct i386_all_regs *regs ) { + struct x86_features features; + + /* Check for FXSR bit */ + x86_features ( &features ); + if ( ! ( features.intel.edx & CPUID_FEATURES_INTEL_EDX_FXSR ) ) + regs->flags |= CF; + DBGC ( &features, "FXSAVE/FXRSTOR is%s supported\n", + ( ( regs->flags & CF ) ? " not" : "" ) ); +} + PROVIDE_UACCESS_INLINE ( librm, phys_to_user ); PROVIDE_UACCESS_INLINE ( librm, user_to_phys ); PROVIDE_UACCESS_INLINE ( librm, virt_to_user ); |